you do realise you are only 100rpm different from stock at 100km/h?
3.9's from a NT would take you closest to stock (but you'll be revving 100rpm harder than stock at 100km/hr)
Any other gearset will have cruise revs way high - 3734@ 100km/h with 4.1 diff gears.
OR
you could put 6:1's in the transfer. with no other change, your cruise revs will run 3587, but your crawl will go from 34:1 to 88:1
Steve.